The conflict was started when Davis, and his friends, were playing music in their car. Dunn told Davis to turn it down, but the two exchanged some words at each other. News4Jax.com Reports:

“Evidently there were words exchanged between our victim, who was sitting in the backseat of that vehicle, and our suspect,” JSO Lt. Rob Schoonover said at a news conference Monday morning. “For whatever reason, our suspect produced a weapon and began firing into the vehicle.”
Jordan Davis, a 17-year-old Wolfson High School student, was shot a couple of times, police said.

Investigators said Dunn’s girlfriend had gone into the store to buy something at the time and was inside when the shooting happened.
“She came running outside and she jumped in the vehicle, when they took off,” Schoonover said.

The woman, whose name was not released, will not face charges, police said. They said she has been cooperating with investigators.
“When she came out, she asked him, ‘What’s going on?’” Schoonover said. “Supposedly his statement was, ‘I just fired at these kids.’ And we believe at that time, I don’t know if he knew he struck anyone in the vehicle. But the next morning, I guess, when they woke up in the hotel and saw the news that someone was killed, that’s when they got in their car and fled back to Brevard (County).”

Witnesses spotted the license plate number and helped police locate Dunn.
“It turned out to be excellent information,” Schoonover said.
Dunn, of Satellite Beach, was arrested Saturday at his central Florida home. Schoonover said he was in the process of turning himself in to his neighbor, who is in law enforcement.